Final answer:
The active phase refers to a stage in labor where the cervix dilates and contractions occur. The dilation and frequency of contractions are important factors during this phase.
Step-by-step explanation:
The subject of this question is Health. The question is asking about the active phase of labor, specifically about the dilation and frequency of contractions, as well as their intensity. The correct answer is d) Answers a and b because both dilation and frequency are mentioned in the active phase.